Phloretin (Dihydrochalcone · GLUT Inhibition · Antioxidant)

Compound	Phloretin
Chemical class	Polyphenol — Dihydrochalcone (2′,4′,6′,4-Tetrahydroxydihydrochalcone)
CAS	60-82-2
Primary source	Malus domestica (apple leaves, bark, root bark)
Key applications	Antioxidant, anti-inflammatory, insulin-sensitising, GLUT inhibition
Claim strength	Moderate
Typical form	Apple polyphenol extract; phloretin isolate
Buy from Herbuno	Green Apple Extract Powder → Bromelain 3000 GDU/g Powder (Pineapple Extract) | Standardized Ananas comosus →

Name origin: From Greek phloos (bark) — phloretin was first isolated from apple tree bark. It is the aglycone of phloridzin (the glucoside), formed by hydrolysis of the C2′-glucoside bond. Phloretin belongs to the dihydrochalcone subclass — the fully reduced (C2–C3 saturated) open-chain form. Traditional use: Apple bark and root bark preparations have folk medicine use in European traditions for fever management and anti-inflammatory applications. Phloretin has not been specifically targeted in traditional medicine; its pharmacological profile has been defined through modern research. Research trajectory: Phloretin has an established evidence base for GLUT1/GLUT2 glucose transporter inhibition (relevant to blood glucose management), antioxidant activity, and anti-inflammatory NF-κB suppression. It is structurally the precursor to the SGLT2 inhibitor drug class (via its glucoside phloridzin). Commercial source: Commercially available as a constituent of apple polyphenol extract and as an isolated dihydrochalcone from apple tree bark. See sourcing options below.

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Evidence for Phloretin Applications

GLUT inhibition and blood glucose modulation: Phloretin inhibits GLUT1 and GLUT2 (facilitative glucose transporters) at low micromolar concentrations, reducing cellular glucose uptake. In animal models of diabetes, phloretin improves glycaemic control and insulin sensitivity. Unlike phloridzin (SGLT inhibitor), phloretin targets facilitative rather than active glucose transport. Relevant for blood glucose management formulations. Claim strength: Moderate.

Antioxidant and cytoprotective: Phloretin is a potent radical scavenger with documented DPPH, ABTS, and metal chelation activity. The dihydrochalcone scaffold allows flexible radical scavenging geometry. Nrf2 activation and HO-1 upregulation are documented in hepatic and neuronal cell models. Claim strength: Moderate.

Anti-inflammatory: Phloretin suppresses NF-κB, COX-2, and TNF-α across macrophage and epithelial models. In vivo anti-inflammatory efficacy is documented in colitis and lung injury animal models. Claim strength: Moderate.

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Dosage & Formulator Specification

No established human clinical dose for isolated phloretin. Based on pharmacokinetic extrapolation and preclinical effective dose modelling: 50–200 mg/day phloretin equivalent is a working formulation range for antioxidant and metabolic applications. Apple polyphenol extract standardised to phloretin content is the primary commercial delivery vehicle.

Green Apple Extract Powder from Herbuno delivers phloretin alongside phloridzin, chlorogenic acids, and catechins — providing complementary glucose-management mechanisms. For targeted phloretin delivery, specify minimum phloretin content (HPLC) in extract specification alongside total polyphenol grade.

Phloretin has low aqueous solubility; absorption is improved in lipid-containing food matrices. Cyclodextrin complexation or nanoencapsulation significantly improves dissolution. Stable at neutral pH; dihydrochalcone bond is more stable than chalcone under acidic conditions. Compatible with standard encapsulation and tablet compression.

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Frequently Asked Questions — Phloretin

Is phloretin the same as phloridzin?
Phloretin is the aglycone; phloridzin is phloretin-2′-O-glucoside. Phloridzin inhibits SGLT1/SGLT2 (active sodium-glucose co-transporters in the gut and kidney). Phloretin inhibits GLUT1/GLUT2 (facilitative glucose transporters in most cell types). Both reduce glucose absorption/uptake but via entirely different transporter mechanisms. Phloridzin is the more pharmacologically potent glucose-lowering compound and is the structural template for SGLT2 inhibitor drugs.

Can phloretin be positioned as a natural glucose management ingredient?
Yes, with appropriate claim-strength context. GLUT1/GLUT2 inhibition by phloretin is mechanistically established in cell and animal studies. Human pharmacokinetic and clinical outcome data for isolated phloretin are limited. Position as “may support healthy glucose metabolism” or “studied for glucose transporter modulation” rather than diabetes management claims.

Does phloretin have skin benefits as a topical ingredient?
Yes. Phloretin is used in premium cosmetic formulations (notably Skinceuticals C E Phloretin CF) for antioxidant protection and vitamin C stabilisation. Topical phloretin enhances vitamin C skin penetration via GLUT-mediated transport modulation and provides independent antioxidant activity. This is a well-established cosmeceutical application.

Is phloretin found only in apples?
Phloretin and its glucoside phloridzin are characteristic of the Rosaceae family, particularly Malus (apple), Pyrus (pear), and Prunus species. Apple is the primary commercial source. Phloridzin concentration is highest in root bark; phloretin concentration increases in the aglycone fraction of mature leaves and as phloridzin is hydrolysed during processing.

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Claim-strength scale – High = multiple human RCTs; Moderate = limited trials or strong preclinical convergence; Emerging = early-stage lab or animal data.

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